you don't have to set up a corporation, you can fill out the schedule C, all money coming to your bank act must be reported. If you have a business act even better, that way you can keep track of all the income, expenses and bookkeeping. (mileage, hotels, photography, ads, health insurance, phone, internet, etc).
For now, keep receipts of all your work expenses related, you can find on twitter some professional ladies that prepare taxes for us.
You will need taxes for 2 years (as self-employee) in order to purchase a home for example.
I dont mention names for the ladies that do this type of service for discretion... but again... on twitter you can find them.
On the providers only board you can get this info, or other sites that are for ladies use only.
Good luck!